i want to maintain data filled in the forms while navigating to other forms

Question

hi,, i am new to asp.net
 i have a registration form,where i have 3 pages, when i fill the first page and move to next page(form 1 to form 2), manny times it hapens that i loose the information filled on first page  when i come back on the first form from form no2.  how to maintain the  information filled on form while navigating?           i have heard about viewstate... but is tht the only solution?